The reason why putting "1 of 1" on all five of the discs is unintuitive, is because... each one should *technically* say 1 of 5, 2 of 5 etc. So then how is the order found? Apparently I would say by the reference number on each disc (CR1001, 1002, 1003 etc). And I would assume I_BASE_01 would also be the starting disc due to the 'base' in the name. Now--that means deliberate, sort of like how IBM didn't bother to colour code mouse and keyboard ports--or on the PS/2s just with "1 / 2" without any legends. Of course "1" was the keyboard

Oh and get this... every jewel case has a sticker that states "LOAN MEDIA - RETURN TO IBM". They were manufactured in the year 2000, I guess IBM just left a bunch of their vendors and parties with old media that they could care less about.
Here are the discs based on the main number that's printed on each... because each one says order 1 of 1, again, it's sort of difficult to determine in what order they (should) go:
#1 I_BASE_01
Ref.No.: CR1001
#2 B2924_01
Ref.No.: CR1002
#3 B2924_02
Ref.No.: CR1003
#4 B2924_03
Ref.No.: CR1004
#5 L2924_01
Ref.No.: CR1005
All discs have the following:
Product Number: 5755-AS5
Release:040000
Made in Canada :0)
Well... I hope that would demystify anyone who has the media and isn't sure what order to use. Keep in mind you'll need to use the diagnostic IPL from the operator panel prior to turning the machine on--so that it's on the correct mode.